Carborundum Corporation

All materials in the combustor and gas burner were of Type 304 stainless steel. Entry ports into the combustor were also constructed from stainless steel. The combustor, sand disengager, EHE, and sand recycle leg were wrapped with two layers of Fiber-frax (registered trade name of Carborundum Corporation) insulation to reduce heat losses. 

Carborundum Corporation Boron Nitride BX>ision 168 Creekside Drive Amherst, NYl4228-2027, USA tel 1 716 691 2051 fax 1 716 691 2090 boron nitride 46... 

Cancarb Ltd., 1702 Brier Park Crescent N.W., Medicine Hat, AB TIA 7G1, Canada Carborundum Corporation, Boron Nitride Division, 168 Creekside Drive, Amherst, NY 14228-2027, USA... 

Supplier C-Axis Technology SF grade Millenium Materials 325 mesh Carborundum Corporation... 

In the case of thermosets, deliberate and extensive orientation is virtually unknown. This appears to be the result of the practical difficulties involved, rather than from any theoretical obstacle. For example, it is possible that the fibre Kynol produced by the Carborundum Corporation is oriented to some extent. This is produced from a melt-spun Novolak phenol-formaldehyde resin, which is later further cross-linked with formaldehyde. It is, of course, legitimate to consider carbon fibres as extreme examples of thermosets. Formed by the cyclisation and subsequent graphitisation of polyacrylonitrile (or other suitable precursors), they are highly oriented. 

Carborundum Corporation" published results of a program carried out there to improve the mean value and reduce the variability of the thermal conductivity of their substrates. As a result of their effort the mean thermal conductivity of AIN substrates manufactured by their process was improved fiom 172 W/(m K), with standard deviation of 19.6 W/(m K), to mean of 192 and standard deviation of 3.0 W/mK. 

Silicon carbide is produced most often by the Acheson process, discovered in 1891 by Edward Goodrich Acheson. Later in 1891 he formed Carborundum Corporation to manufacture Sic abrasives. In this process current is passed through a mixture of carbon and sand causing the reaction SiOj -H 3C — SiC + 2CO. When carried out at 2600°C or higher the result is alpha the beta form can be achieved at 1500 to 1600°C. ... 

Fax (216) 529-3954 Email info advceramics.com Website www.advceramics.com CARBORUNDUM CORPORATION, BORON NITRIDE 168 Creekside Dr. 

In the initial thiocyanate-complex liquid—liquid extraction process (42,43), the thiocyanate complexes of hafnium and zirconium were extracted with ether from a dilute sulfuric acid solution of zirconium and hafnium to obtain hafnium. This process was modified in 1949—1950 by an Oak Ridge team and is still used in the United States. A solution of thiocyanic acid in methji isobutji ketone (MIBK) is used to extract hafnium preferentially from a concentrated zirconium—hafnium oxide chloride solution which also contains thiocyanic acid. The separated metals are recovered by precipitation as basic zirconium sulfate and hydrous hafnium oxide, respectively, and calcined to the oxide (44,45). This process is used by Teledyne Wah Chang Albany Corporation and Western Zirconium Division of Westinghouse, and was used by Carborundum Metals Company, Reactive Metals Inc., AMAX Specialty Metals, Toyo Zirconium in Japan, and Pechiney Ugine Kuhlmann in France. 

In the United States, practically all zirconium metal is now being made by the Kroll process. This process was an adaptation to zirconium of a similar process for titanium developed by W. J. Kroll. The work of Kroll and metallurgists of the Albany, Oregon, station of the Bureau of Mines culminated in a plant to produce 135,000 kg zirconium/year at the station. A similar plant was operated by the Carborundum Metals Corporation, at Akron, New York. These have been superseded by the plant of the Teledyne Wah Chang Albany Company, at Albany, Oregon, with a capacity in 1978 of 3.4 million kg/year. 

A similar hexone-thiocyanate process has been operated in the U.S.A., firstly by the Northwest Electrodevelopment Laboratories at Albany since 1952 and the Carborundum Metals Corporation plant near Akron, New York, since 1953. They use packed and unpacked columns and the difficulties associated with polymerization of thiocyanic acid were alleviated by using a solvent consisting of 80 per cent hexone and 20 per cent butyl acetate instead of solely hexone. > The zirconium product is precipitated as the acid sulphate, phthalate or salicylate, and a certain additional degree of purification is obtained at this stage. A typical analysis of pure zirconium oxide after hexone-thiocyanate extraction and salicylate precipitation is as follows ... 

Vectran (fibre) from Hoechst- Celanese and Kuraray, are the copolymers formed by polymerisation of mixtures of p-acetoxybenzoic acid and 6-acetoxy-2-naphthoic acid. Within a range of molar compositions from 75/25 to 40/60 they are readily melt-processable. Polyesters of the Carborundum type became the basis of the commercial product Xydar (Dart Corporation, later Amoco). 

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